i need help to pick a particular image from the database instead of randomly picking an image in the following program:
w=load_database();%%Initializations
% We randomly pick an image from our database and use the rest of the
% images for training. Training is done on 399 pictues. We later
% use the randomly selectted picture to test the algorithm.
ri=round(400*rand(1,1)); % Randomly pick an index.
r=w(:,ri); % r contains the image we later on will use to test the algorithm
v=w(:,[1:ri-1 ri+1:end]); % v contains the rest of the 399 images.
N=20; % Number of signatures used for each image.
%%Subtracting the mean from v
O=uint8(ones(1,size(v,2))); m=uint8(mean(v,2)); % m is the maen of all images.
vzm=v-uint8(single(m)*single(O)); % vzm is v with the mean removed.
%%Calculating eignevectors of the correlation matrix
% We are picking N of the 400 eigenfaces.
L=single(vzm)'*single(vzm);[V,D]=eig(L);V=single(vzm)*V;V=V(:,end:-1:end-(N-1)); % Pick the eignevectors corresponding to the 10 largest eigenvalues.
%%Calculating the signature for each image
cv=zeros(size(v,2),N);for i=1:size(v,2); cv(i,:)=single(vzm(:,i))'*V; % Each row in cv is the signature for one image.
end%%Recognition
% Now, we run the algorithm and see if we can correctly recognize the face.
subplot(121); imshow(reshape(r,112,92));title('Looking for ...','FontWeight','bold','Fontsize',16,'color','red');subplot(122);p=r-m; % Subtract the mean
s=single(p)'*V;z=[];for i=1:size(v,2) z=[z,norm(cv(i,:)-s,2)]; if(rem(i,20)==0),imshow(reshape(v(:,i),112,92)),end; drawnow;end[a,i]=min(z);subplot(122);imshow(reshape(v(:,i),112,92));title('Found!','FontWeight','bold','Fontsize',16,'color','red');
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